All Questions
Tagged with mppt solar-cell
75 questions
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84
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Low Solar Panel Voltage Vmp Operation
so I'm currently working on an MPPT project using Asynchronous Buck Converter with the design :
Capacitor Input : 470uF/100V
Capacitor Output : 1000uF/100V
Inductor : 65uH
fsw : 39khz
current : 30A
...
- 33
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votes
1
answer
36
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Is this solar circuit connection OK?
My inverter requires a 96v battery input and my MPPT solar charge controllers have a maximum battery voltage of 48v, so I connected them together like this:
Is this a bad connection? If yes, what is ...
- 101
0
votes
1
answer
37
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Parallel solar charge controllers
I need to charge a 12V LiFePO4 battery and to get full benefit from my 50W solar panel I need a bit over 4A charge current capabilities.
I've looked through MPPT charge controller ICs and there's the ...
- 439
0
votes
2
answers
215
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Connecting solar cells directly to battery
I'm building a solar powered RC plane and need to design a power system to deliver power from the solar panels to the battery and motor.
I have an array of 38 C60 solar cells outputting 22.8V (0.6*38),...
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0
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36
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1 Solar panel to 2 mppt, to 2 separated batteries
In my motorhome I have 1 solar panel (500w) to a one victrom mppt 30A, to one battery 100A of lifePo4.
Now I need more battery because i have a new 12v fridge, so I bought other battery 230A lifepo4, ...
- 1
2
votes
1
answer
65
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Charging li-ion 72V with solar MPPT controller [closed]
I have an EV 72V li-ion battery with given charger (peaks at 11 A).
My MPPT solar charger is designed among other types for li-ion up to 96V ie 12/24/36/48/60/72/84/96V settable at 72 V. 50 A max.
...
- 23
0
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1
answer
97
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Photovoltaic cells and CC load
Hello! I am newbie in photovoltaic electronics and recently learned about MPPT.
In my project load needs constant current. Does constant ...
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1
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1
answer
140
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Looking for ways to combine the power outputs of different renewable energy sources
I've been researching ways of combining the outputs of different renewable energy sources (e.g. solar panels and DC rectified wind turbines) to provide a single output that could then be connected to ...
- 461
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0
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27
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Switching Parallel Solar Cells
I have a proposed solar system setup where sometimes one set of panels will be covered. The system has control over when the panel is covered or not. I'm thinking of ways to isolate the covered cells ...
- 5,611
1
vote
1
answer
114
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Problem turning on low power (TPS709) to MPPT (ATtiny85) after dawn
I have a relatively low-power autonomous device, which will be left untouched for weeks or months. Solar recharging is therefore very important. Maximising solar power for overcast days is also ...
1
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0
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81
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Why does solar current drop when charging a battery with a MPP controller?
I'm trying to build a model using a PV panel to charge a battery (a buck converter in between). I use a MPP controller to track the maximum power point. The solar irradiance and temperature are set as ...
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1
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118
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Would an MPPT module that charges Li-po batteries work with a NiMH battery?
I'm trying to charge a 9 V, 300 mAh NiMH battery with a 6 V solar panel using a 12 V MPPT module for which the description says it's for Li-po batteries. Would it work with NiMH batteries?
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1
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231
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MPPT solar charge controller - battery charge current at MPP
I am currently planning to design an MPPT solar charge controller and I am trying to follow a reference design from TI - TIDA 010042.
I am planning to use arduino as the microcontroller for this ...
- 69
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126
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MPPT current limitation
I started to work on an MPPT project a couple of months ago. I have the first HW prototype (synchronous buck converter, current/voltage measurement, STM32 uC) and I am still fiddling with the SW side. ...
- 23
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3
answers
79
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Photovoltaic solar cell attached to load device
I am new to the field of power electronics so please bear with me.
From what I understand, photovoltaic cells are often connected to a DC/DC converter and a MPPT power system that allows for (1) ...
1
vote
1
answer
209
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MPPT input current measurement
I am currently working on building an MPPT, in a synchronous buck configuration. The HW side is almost done, I am still figuring out the current measurement and doing some tests to see how current ...
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2
answers
61
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If we change the PV panel, should we also change the MPPT controller block?
I have 6kw PV panel, in case of partial shading it's capacity reduces to 3kw. But, the MPPT tracker I designed it specifically for that 6kw rating, now because of partial shading the same MPPT tracker ...
- 9
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75
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How to asses the performance of an MPPT algorithm?
I have a standalone pv system with PV Panel rating 6820W, a buck converter, 12V battery , DC resistance (load) of 8 ohm with Perturb and observe (P&O) as the control algorithm.
Upon simulating, ...
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0
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95
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How to calculate the maximum load that a standalone PV system can handle?
I have a 6820W pv panel, a boost converter, a H-bridge inverter, a 48V 540Ah LI-ion battery, a 100ohm dc and a 100ohm ac load in my system. My question is what is the maximum load that this system can ...
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72
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MPPT solar buck charger - how does it sense when to change charge stage/regime
I have a well-engineered MPPT buck solar charger that I am looking to repair; the schematic is unavailable.
The charger is unstable, and randomly changes what charge regime it's in.
Does anyone know (...
2
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1
answer
775
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Parallel-series connection of an odd number of solar cells
I plan on having the following array in my system:
Vmpp voltage at max. power point for each cell is 1.67 V
Impp current at max. power point is 18.4 mA
As the number of cells in the right "...
- 21
0
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0
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147
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Using a boost converter controller in an MPPT application
I am hoping to use a standard synchronous boost converter (LTC3786) for MPPT controlled solar panel to battery.
Nearly all applications I see make reference to adjusting the PWM DC to control input ...
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1
vote
0
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514
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Can I use "ideal diode" in series in solar cells?
i have a small experimental solar panel system to gain knowledge before moving on large power systems.
My system is 5 solar cells in series, each 5.8V 0,52A (peak power). So total is 29V 0,52A (about ...
- 195
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67
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The purpose of solar MPPT? [duplicate]
I already know what a MPPT is supposed to do. It's basically a buck/boost converter connected to a solar panel that finds the ideal power output by changing (boosting or lowering) the voltage of the ...
0
votes
1
answer
44
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Need help with maximum safe load on a C10 battery in a Solar power system
I have a solar system with 20Amps/12v MPPT, 150ah/12v C10 battery, 500watts/24v panel and 1000va inverter. I have a few questions.
Can I use a 750w cloth iron on this for 30 minutes? As per my ...
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0
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81
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how to create electronic switch cut off PV from MPPT charger when no battery connection
MPPT chargers are sensitive if PV is connected without battery connection. MPPT will be destroyed.
So I want put electronic switch on MPPT PV input in a relation with battery voltage
.
No voltage on ...
- 1
0
votes
1
answer
307
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MPPT charge controllers in series to handle high voltages
If I have 500v of solar power can I run 10 mppt charge controllers in series? So each mppt would only see 50v because I'd be using 10 cheap mppt controllers in series. From there it'd be charging a ...
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1
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0
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38
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Getting most power from low voltage solar powers, each different angle
I have a specific problem. I have 10 small solar panels, each max 5.5V and 100mW power. Each one is at a different angle. I want to get the most power out of it. Cost is not really a problem, but I do ...
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347
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Question about setting the MPPT on BQ24650
I have a question about the MPPT in BQ24650 chip.
It has the MPPTSET pin that need to get 1.2v because the inside comparator.
According to the datasheet, on ...
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1
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1
answer
607
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Some questions about the CN3722 solar charging IC and its MPPT setting
I'm currently working on a project where I have to charge batteries by solar. For this reason I chose the CN3722 IC. Since I want to create my own PCB with all the necessary parts I had to read the ...
- 159
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1
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442
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DC converter use in solar cell MPPT
According to this project
I saw many design use same principle by using MPPT to adjust PWM of buck converter.
I totally get MPPT algorithms except the DC to DC converter part.
Let's call solar panel ...
- 1,444
1
vote
2
answers
717
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Low voltage MPPT boost converter IC, constant input voltage
Following scenario: I have a bunch of Sunpower C50 unprocessed single solar cells. I'm trying to make a panel out of them for hiking. According to the datasheet each cell has 0.574 Vmpp an 5.65 Impp ...
0
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1
answer
532
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MPPT buck converter vs Ordinary buck converter?
I’m building a small arduino project which is going to be powered using a small solar panel setup with a battery as it’s UPS for power backup during the dark.
The setup is going to be like
Solar ...
- 712
0
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1
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493
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overcharging issues in MPPT solar controller with NO output leads
My MPPT solar controller has no output leads. It contains only the (+,-)leads for battery and solar panel. Input is from the solar panel and output goes to battery.Therefore, I have to connect my load ...
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1
vote
1
answer
846
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MPPT Reads Negative Amps
I have MPPSolar PCM5048 MPPT which is connected between the solar panels and the batteries. It was working well until yesterday as a sudden it reads negative amps on the battery current. it keeps ...
- 133
1
vote
1
answer
78
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Cable length and voltage drop in offgrid solar installation
I have connected my Lithium-ion battery pack(11.1v 100ah ) with my Epever MPPT charge controller using 5M length of 8 AWG cable. when i put load which consume around 12A , the charger controller shows ...
- 21
2
votes
1
answer
189
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Solar panel and power bank
I would like to charge a 20,000mAh power bank with a 18V 20W solar panel. The power bank has 8*18650 batteries in parallel. I came out with 3 options.
The first one is to use a buck DC-DC converter ...
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2
votes
2
answers
2k
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How to tell if a solar regulator is MPPT or PWM
I have a solar cell charging a 12v battery via a maplin TPS 1230 solar charge regulator. By using some basic instrumentation and some simple maths (i.e. measuring the current and voltage on the input &...
- 1,007
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votes
1
answer
69
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Drawin max power out of solar panel by keeping its voltage constant
I wanna build a simple MPPT that keeps voltage on output of the solar panel constant. According to documentation, maximum power is drawn, when output voltage is about 4.2V. My way of reasoning is like ...
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1
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3
answers
2k
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Can I use a MPPT Solar Controller to charge my auxillary 12V AGM Battery from the car battery/alternator?
I have a RedArc solenoid and a Victron 75/15 Smart Solar Controller. Can I use the combination of these two units to charge an 12V AGM Deep Cycle auxiliary battery from the car battery/alternator ...
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5
answers
2k
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Achieving MPPT of a solar panel with an LM2596
I'm having some trouble with DC converters in a solar power system.
I have a solar panel of 21 V (Voc) and 1.33 A (Isc). I have reaf that using a DC buck converter with input regulation (feedback loop ...
- 63
0
votes
1
answer
39
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Designing an effective extensible solar cell + car battery setup [closed]
I've got a cabin that I visit on weekends and because I need to charge my computer and tools there, I decided to bring an old car battery and bought a solar panel to charge it. Right now I use a cheap ...
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3
votes
0
answers
108
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New DIY project try to understand MPPT [closed]
I got used battery MODULE with the next specs
"40V 18.4AH 736WH build of ninety six A123-26650 LITHIUM LIFEPO4 cell "
Cell specs:
Nominal Capacity: 2300mAh
Voltage(nominal,V): 3.3V
Internal ...
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6
votes
4
answers
9k
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How do MPPT charge controllers curtail the power if the load is less than the solar generation?
I am trying to understand how MPPT charge controllers work when the load is less than the solar power generation. Let's assume an off-grid system with battery backup and no dump load. In my ...
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2
votes
1
answer
5k
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How to efficiently charge 48V battery-motor system with solar panels
I'm wondering how to efficiently charge and use the following system with standard 18V solar panels:
48V lead-acid battery
1kW electric motor
To charge the battery with either PWM or MPPT, the solar ...
- 131
0
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1
answer
80
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Parallel 'Gang' Wiring Several Solar Panels
I need to connect 3 similar 180W solar panels to my MPPT. Each one outputs max 9A. I would like to send a + wire and a - wire for each panel back to either a bus bar or a fuse box... and then use a ...
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-1
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1
answer
114
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Solar and Batteries [closed]
I want to ask a few questions that relate to solar panels and the charging of batteries. I have looked all over the internet for answers but have not found anything that answers my concerns. The most ...
- 13
-1
votes
1
answer
173
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MPPT Sunny Buddy (LT3652) + Solar Panel Voltage [closed]
I am having an issue using the sunny buddy mppt charger -
The PV panels I am using give a voltage of 11-12V but when I connect the battery to the mppt, the voltage drops to 4-5V. Does anyone know ...
0
votes
2
answers
207
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Cutting Power to Solar MPPT
I have an EPEver 3210A MPPT connected to my solar panel and a battery to charge. I'm initially experimenting with a small size battery (12 V, 7 Ah) before I upgrade. The MPPT pulls 100 mA from the ...
- 108
5
votes
2
answers
2k
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How do SolarEdge power optimizers work? Can I use them to charge battery pack directly?
When looking for some MPPT solutions for a solar car, one of the things I have considered were these wonderful small "Solar Optimizer" modules provided by SolarEdge. However, they are ...
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